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(2) Instruction execution time when accessing the DN211 from the T2/T2E/T2N
When outputting data to slave devices from the T2/T2E/T2N through the DN211, the WRITE
instruction writes the output data in the DN211 from the T2/T2E/T2N. When inputting data from
slave devices through the DN211, the READ instruction reads from the DN211.
Table 1.6 lists the instruction execution times of the T2/T2E/T2N.
The DN211 has 128 words for the output data area (area where output data to slave devices are
stored) and 128 words for the input data area (area where input data from slave devices are
stored).
Table 1.7 lists the execution times for the WRITE/READ instructions by the T2/T2E/T2N when
accessing 128 words. When input/output data with slave devices is smaller than 128 words, the
instruction execution time becomes shorter.
Conversely, when accessing the output data area/input data area several times, the sum of
instruction execution times increases depending on the number of accessed times (the output data
area/input data area is explained in "4.2 The Input/Output Data Area.")
Table 1.6 READ/WRITE Instruction Execution Time ( s)
T2 T2E/T2N
READ instruction
WRITE instruction
720 + 9.0 × N
721 + 15.0 × N
430 + 5.6 × N
427 + 10.6 × N
N: Number of transfer words
Table 1.7 Maximum Execution Time for DN211 Access (ms)
(128 words for input/output)
T2 T2E/T2N
READ instruction
WRITE instruction
1.87
2.64
1.15
1.78
Total 4.51 2.93
The values in Table 1.7 indicate times for accessing the DN211. When you are mounting more than
one DN211 unit, calculate and total the instruction execution times to access individual
DN211 units.
One unit of T2/T2E/T2N cannot cover the entire DN211 units being mounted when the
total of the sum times necessary for the T2/T2E/T2N's accessing the DN211 units and
the sum time necessary for input, output, and internal processing except for accessing
the DN211 units are larger than the response time that your system requires.
In this case, divide your T2/T2E/T2N to mount DN211 units, depending on your system
configuration.